What problems should I pay attention to when buying digital cameras?

Many consumers, because they don't understand digital cameras, unilaterally think that pixels are high. Not exactly. When choosing a digital camera, we should consider its digital and optical characteristics.

1, digital camera lens. A well-designed high-end camera lens consists of multiple groups of lenses, including aspherical lenses, which can significantly reduce color shift and minimize graphic distortion and distortion. Expensive fluorite or glass is used as a lens. In order to reduce weight and cost, the lenses of household and semi-professional cameras are made of resin.

2. Image value of CCD of digital camera. CCD is the heart of digital camera, and it is also one of the main factors that affect the manufacturing cost of digital camera. Therefore, it has become an important standard for digital camera classification. At present, the entry-level product is 130-265438+ million pixels, while commercial and semi-professional users prefer products with more than 3 million pixels.

3. Zoom of digital camera. Optical zoom is a real zoom, which will not affect the imaging quality of photos; Digital zoom is electronic zoom, which is a local enlargement at the expense of photo clarity.

4. Battery and power consumption of digital camera. Digital cameras have LCD screens and built-in flashlights, so the battery consumption is higher than that of traditional cameras. It's cheap to use the No.5 battery, and you can buy it anytime and anywhere, but it won't take long for the battery to die. Therefore, it is best to choose the model equipped with rechargeable lithium battery. At present, mainstream digital products have been designed as lithium batteries, and complete charging equipment is provided as accessories.

5. Additional functions. The more functions, the more fun and uses it means to use a digital camera. For example, many digital cameras have video output function, which can be connected to TV to browse photos; Some can set their own startup screen and shutter sound like mobile phones; Some can have short-term digital video recording function. The driver installation of digital camera should be very simple, and it should be able to download pictures quickly and preview them. For example, the software function attached to Canon digital camera is perfect, which can classify and manage pictures, and the settings when printing are more diverse, and pictures can also be simply modified.

6. First of all, choose from the imaging quality.

In addition to the lens quality, the imaging quality of a digital camera largely depends on the pixel level of the imaging chip. The charge-coupled poles on the chip are called pixel points. The more pixels, the higher the pixel level, the higher the resolution of the image, and the more delicate, clear and distinct the picture. On the contrary, the coarser the picture. The higher the pixel level and resolution, the higher the grade and price of the camera, and the better the imaging quality. When buying a digital camera, if financial resources allow, the higher the resolution, the better; But don't blindly pursue high resolution, do what you can according to the purpose of use. Generally speaking, you shoot to display on a computer screen or design on a web page, so you can choose an economical and practical camera with a resolution of 640×480. If you want to output images and require photos to be relatively clear and realistic, you should choose a camera with a resolution above the middle range (for example,1024× 768); If you are a professional photographer or editor, you should choose a high-resolution camera (such as model 1620× 1200).

7. Selection of storage medium (shooting times)

The storage capacity of a digital camera determines the number of photos you can take. The larger the storage capacity, the better. At present, most cameras can use a portable memory card and a slot (PcmcLA is installed on the camera body), which brings convenience to the expansion of capacity. Like a negative, you can change another memory card to continue shooting after shooting, which greatly increases the number of shooting.

8, automatic zoom function

In recent years, more and more digital cameras have adopted CCD and TTL auto-focusing methods, which further improve the focusing accuracy and greatly improve the image quality. In the exposure mode, there are three modes: shutter priority automatic exposure, aperture priority automatic exposure and manual exposure. Consumers can choose according to their own habits and hobbies and their own photography skills. CCD digital cameras are divided into two types: area CCD and scanning linear CCD.

The advantage of CCD area array digital camera is its high shooting speed, and there is no special requirement for shooting moving scenes and using flash. The resolution of linear CCD camera is very high, but the exposure time is long, so it is impossible to shoot moving scenes or flash photography. Therefore, the scanning linear camera can only be used for still life shooting, and the purchase depends on the usage.

9, the quality of the lens

Nowadays, most digital cameras use built-in zoom lenses, in which aspherical lenses are used, and the number of apertures has also increased from 2-3 to about 6. The aperture of the lens is also obviously enlarged, and there are various zoom lenses, which greatly improves the shooting flexibility and imaging quality; Some cameras also have electronic zoom function, which can improve the shooting ability of ultra-long distance, especially suitable for field researchers.

10, LCD function

Digital cameras with LCD display function can facilitate people to browse and edit photos, and also allow you to preview and check the subject before shooting, and delete unnecessary parts, so as to make full use of the camera's limited storage capacity before downloading to PC. At present, the display modes of the monitor include enlargement, slide show, continuous play and simultaneous display of multiple pictures. The display screen is usually 1.8 inch and 2 inch, and some products have reached 2.5 inch. The bigger the display window, the better.

1 1, special function

At present, some digital camera products have auxiliary functions such as recording function, macro shooting function, image processing function and high-speed continuous shooting function, which provides consumers with a broader choice space.